linux-kernel - Re: [PATCH v5 2/8] watchdog: Introduce WDOG

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Message-ID: <20151123192606.GB19888@pengutronix.de>
Date:	Mon, 23 Nov 2015 20:26:06 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-watchdog@...r.kernel.org, Wim Van Sebroeck <wim@...ana.be>,
	linux-kernel@...r.kernel.org,
	Timo Kokkonen <timo.kokkonen@...code.fi>,
	linux-doc@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v5 2/8] watchdog: Introduce WDOG_RUNNING flag

Hello Guenter,

On Sun, Nov 22, 2015 at 07:20:59PM -0800, Guenter Roeck wrote:
> diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
> index b535b02b1d7f..f0292d56caf0 100644
> --- a/include/linux/watchdog.h
> +++ b/include/linux/watchdog.h
> @@ -108,6 +108,7 @@ struct watchdog_device {
>  #define WDOG_ALLOW_RELEASE	2	/* Did we receive the magic char ? */
>  #define WDOG_NO_WAY_OUT		3	/* Is 'nowayout' feature set ? */
>  #define WDOG_UNREGISTERED	4	/* Has the device been unregistered */
> +#define WDOG_RUNNING		5	/* True if HW watchdog running */
>  	/* the following variables are for internal use only */
>  	struct mutex lock;
>  	unsigned long last_keepalive;
> @@ -124,6 +125,12 @@ static inline bool watchdog_active(struct watchdog_device *wdd)
>  	return test_bit(WDOG_ACTIVE, &wdd->status);
>  }
>  
> +/* Use the following function to check whether or not the watchdog is running */

I'd like to have this comment more clear to distinguish between device
state and userspace view. Maybe also call the flag WDOG_HW_RUNNING to
make this more clear?

> +static inline bool watchdog_running(struct watchdog_device *wdd)
> +{
> +	return test_bit(WDOG_RUNNING, &wdd->status);
> +}
> +

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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